refactor: use htmx instead of dwn for vault client

x/vault/client/dwn/state/openid.go

@@ -1,23 +0,0 @@
-package state
-
-import (
-	"github.com/labstack/echo/v4"
-)
-
-func grantAuthorization(e echo.Context) error {
-	// Implement authorization endpoint using passkey authentication
-	// Store session data in cache
-	return nil
-}
-
-func getJWKS(e echo.Context) error {
-	// Implement token endpoint
-	// Use cached session data for validation
-	return nil
-}
-
-func getToken(e echo.Context) error {
-	// Implement token endpoint
-	// Use cached session data for validation
-	return nil
-}